水下抗分散水泥土正交试验及配比优化方法研究  

Research on Orthogonal Experiments and Optimization of Mixing Ratios for Underwater Anti⁃Dispersion Cement⁃Stabilized Soil

作　　者：黄挺[1,2] 郑杰 戴国亮[3] 谭慧明[1,2] HUANG Ting;ZHENG Jie;DAI Guoiang;TAN Huiming(Key Laboratory of Coastal Disaster and Defence of Ministry of Education,Hohai University,Nanjing 210098,China;College of Harbor,Coastal and Offshore Engineering,Hohai University,Nanjing 210098,China;School of Civil Engineering,Southeast University,Nanjing 210096,China)

机构地区：[1]河海大学海岸灾害及防护教育部重点实验室,江苏南京210098 [2]河海大学港口海岸与近海工程学院,江苏南京210098 [3]东南大学土木工程学院,江苏南京210096

出　　处：《防灾减灾工程学报》2024年第3期678-688,744,共12页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家自然科学基金项目(52078128)资助。

摘　　要：水流经过桩基时会形成漩涡侵蚀床面,影响桩基及上部结构的稳定性,冲刷治理是工程界关注的热点问题。为促进固化土技术在桩基冲刷修复中的应用,设计开展了抗分散水泥固化土系列正交试验。针对高岭土和淤泥土,选用PAM、EVA、黄原胶、HPMC四种抗分散剂,采用平均效果分析和极差分析,研究了抗分散剂种类、抗分散剂掺量、含水量和水泥掺量对流动度、浊度、7 d和28 d无侧限抗压强度的影响。结果表明:对于高岭土,抗分散剂掺量从0.25‰增大到1‰,水泥土流动度减小20%,浊度减小25%,抗分散剂掺量对流动性和抗分散性的影响显著。对于淤泥土,对抗分散性影响显著的仍是抗分散剂掺量,而对流动性的影响显著的则是含水量,含水量从1.4倍液限增大到2.0倍液限,水泥土流动度增大45%。基于综合平衡法、矩阵分析法和多元线性回归模型,提出了一种抗分散水泥土配比设计方法,研究得到了高岭土和淤泥土抗分散水泥固化土的推荐配比,其在泥沙起动实验中的抗冲刷特性明显优于原始土样。Water flow around pile foundations can create vortices that erode the bed surface,compro-mising the stability of both pile foundations and superstructure.Therefore,addressing scour manage-ment has always been a hot topic in engineering.To advance the application of cement-stabilized soil technology in scour repair for pile foundations,orthogonal experiments were designed and carried out on dispersion-resistant cement-stabilized soils.Four types of anti-dispersants,PAM,EVA,xanthan gum,and HPMC,were selected for kaolinite and silt soils.The effects of anti-dispersants type,anti-dispersant dosage,water content,and cement dosage on fluidity,turbidity,and unconfined compres-sive strength at 7 and 28 days were studied using average effect and range analysis.The results showed that for kaolinite,increasing the anti-dispersants content from 0.25‰to 1‰decreased the fluidity of the cement-stabilized soil by 20%and turbidity by 25%,demonstrating a significant impact on both fluidity and anti-dispersion properties.For silt soils,the anti-dispersant dosage significantly in-fluenced anti-dispersion properties,while water content was the main factor affecting fluidity.When the water content increased from 1.4 wL to 2.0 wL,the fluidity of cement-stabilized soil increased by 45%.Based on the comprehensive balance method,matrix analysis method,and multiple regression linear model,a method for designing the mixing proportions of anti-dispersion cement-stabilized soil was proposed.The recommended ratio of kaolinite and silt soils showed significantly better anti-scour characteristics in the sediment initiation experiments compared to the original soil sample.

关 键 词：正交试验 抗分散水泥土 极差分析 综合平衡法 矩阵分析法 回归分析 

分 类 号：TU443[建筑科学—岩土工程]